Shadow Catcher blocks background image in 2.8
Found out an answer. I should've just searched tutorials instead of troubleshooting forums instead.

Here's the link that helped.
https://www.blendernation.com/2017/04/17/use-new-blender-shadow-catcher/

So I apparently just needed to hit render and mix up some nodes in the compositor. 

Thanks to the people who took their time to correct my post as well!